package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import net.bytebuddy.implementation.bytecode.Throw;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long id = BaseContext.getCurrentId();
        shoppingCart.setUserId(id);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
//        log.info("添加 -- 当前购物车信息{}",list);
        //如果已经存在 将数量加1
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1); // 执行aiupdate语句
            shoppingCartMapper.updateNumberById(cart);
        } else {
            //如果不存在 加入列表
            //判断本次添加是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();

            if (dishId != null) {
                //菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
                //insert
            } else {
                //套餐 添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);

                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
                //插入
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     *
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long id = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(id).build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        //获取当前购物车数据
        Long id = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(id);
    }

    /**
     * 用户删除菜品数据
     *
     * @param shoppingCartDTO
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //获取当前购物车信息
        Long id = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(id);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
//        log.info("当前购物车信息{}",list);
        if (list != null && !list.isEmpty()) {
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if (number > 1) {
                //份数大于一直接减少
                shoppingCart.setNumber(number - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            } else {
                // 移除

                shoppingCartMapper.deleteById(shoppingCart.getId());
            }
        }else {
            throw new ShoppingCartBusinessException("未知错误");
        }

    }
//    /**
//     * 删除购物车中一个商品
//     * @param shoppingCartDTO
//     */
//    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
//        ShoppingCart shoppingCart = new ShoppingCart();
//        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
//        //设置查询条件，查询当前登录用户的购物车数据
//        shoppingCart.setUserId(BaseContext.getCurrentId());
//
//        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
//
//        if(list != null && list.size() > 0){
//            shoppingCart = list.get(0);
//
//            Integer number = shoppingCart.getNumber();
//            if(number == 1){
//                //当前商品在购物车中的份数为1，直接删除当前记录
//                shoppingCartMapper.deleteById(shoppingCart.getId());
//            }else {
//                //当前商品在购物车中的份数不为1，修改份数即可
//                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
//                shoppingCartMapper.updateNumberById(shoppingCart);
//            }
//        }
//    }
}
